Complete specifications and system details can be viewed all in one place with the jailbreak tweak iDevice Wise. Once installed, there's no app or configuration to deal with.
Simply navigate to Settings -> iDevice Wise and scroll through the specs organized by section. Everything from Firmware Version to Capability Information, Wireless, Battery and more can be viewed instantly.
iDevice Wise provides quick access to more than 50 pieces of information about the iOS device on which it's installed. The list is extensive, and easily shows what's going on behind the scenes on any jailbroken iOS device.
iDevice Wise is available on Cydia from the BigBoss repo for $1.99. Jailbreak iOS 7.1.x with Pangu to start customizing iOS. Check here for instructions on how to jailbreak iOS 7.0.x with evasi0n 7. You can also find out how to purchase and install Cydia tweaks with this guide.